Transmitting ultrasonic via vibration. Pest repeller is used to affect the acute hearing of underground rodents, with very effective preventive effect. The ultrasonic will deceive them, making them feel endangered, so as to force them away from the vibrating area. Transmitting ultrasonic every 30 senconds.
Effective Range: 625M2 Frequency: 300-700Hz Rechargeable batt included, 1.2V 800MAh Ni-Cd.